<!DOCTYPE html>
<title>VT object created on the old Document is skipped before persisting in BFCache</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/html/browsers/browsing-the-web/back-forward-cache/resources/helper.sub.js"></script>
<script>
// runBfcacheTest opens a popup to pageA which navigates to pageB and then
// back, ensuring pageA is stored in the BFCache.

runBfcacheTest({
  funcBeforeNavigation: async () => {
    // This function executes in pageA

    function addTransitionOptIn() {
      let css = '@view-transition { navigation: auto; }';
      let style = document.createElement('style');
      style.appendChild(document.createTextNode(css));
      document.head.appendChild(style);
    }
    addTransitionOptIn();

    // Wait for at least one frame to ensure there is a transition on the
    // navigation.
    function waitForAtLeastOneFrame() {
      return new Promise(resolve => {
        // Different web engines work slightly different on this area but waiting
        // for two requestAnimationFrames() to happen, one after another, should be
        // sufficient to ensure at least one frame has been generated anywhere.
        window.requestAnimationFrame(() => {
          window.requestAnimationFrame(() => {
            resolve();
          });
        });
      });
    }
    await waitForAtLeastOneFrame();

    onpageswap = (e) => {
      if (e.viewTransition == null)
        return;

      document.documentElement.classList.add('transition');

      e.viewTransition.updateCallbackDone.then(() => {
        document.documentElement.classList.add('updateCallbackDone');
      });

      e.viewTransition.ready.catch(() => {
        document.documentElement.classList.add('ready');
      });

      e.viewTransition.finished.then(() => {
        document.documentElement.classList.add('finished');
      });
    }
  },
  funcBeforeBackNavigation: async () => {
    // This function executes in pageB

    function addTransitionOptIn() {
      let css = '@view-transition { navigation: auto; }';
      let style = document.createElement('style');
      style.appendChild(document.createTextNode(css));
      document.head.appendChild(style);
    }
    addTransitionOptIn();

    // Wait for at least one frame to ensure there is a transition on the
    // navigation.
    function waitForAtLeastOneFrame() {
      return new Promise(resolve => {
        // Different web engines work slightly different on this area but waiting
        // for two requestAnimationFrames() to happen, one after another, should be
        // sufficient to ensure at least one frame has been generated anywhere.
        window.requestAnimationFrame(() => {
          window.requestAnimationFrame(() => {
            resolve();
          });
        });
      });
    }
    await waitForAtLeastOneFrame();
  },
  funcAfterAssertion: async (pageA, pageB, t) => {
    assert_true(
      await pageA.execute_script(() => {
          return document.documentElement.classList.contains('transition');
      }),
      'navigation had viewTransition');

    assert_true(
      await pageA.execute_script(() => {
          return document.documentElement.classList.contains('updateCallbackDone');
      }),
      'updateCallbackDone was resolved');

    assert_true(
      await pageA.execute_script(() => {
          return document.documentElement.classList.contains('ready');
      }),
      'ready was rejected');

    assert_true(
      await pageA.execute_script(() => {
          return document.documentElement.classList.contains('finished');
      }),
      'finished was resolved');
  },
  targetOrigin: originSameOrigin,
});
</script>
